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Securities - Schedule of Amortized Cost, Fair Value and Gross Unrealized Gains and Losses for Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	$ 5,654,232	$ 5,378,912
Gross Unrealized Gains	13,246	12,035
Gross Unrealized Losses	(547,777)	(642,009)
Held to Maturity, Fair value	5,119,701	4,748,938
Allowance for Credit Losses	(1,845)	(2,645)
Net Carrying Amount	5,652,387	5,376,267
U.S. Treasury [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	38,249
Gross Unrealized Gains	4
Gross Unrealized Losses	(115)
Held to Maturity, Fair value	38,138
Net Carrying Amount	38,249
U.S. Agencies [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost		116,331
Gross Unrealized Losses		(581)
Held to Maturity, Fair value		115,750
Net Carrying Amount		116,331
Mortgage-backed [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	2,573,708	2,523,134
Gross Unrealized Gains	170
Gross Unrealized Losses	(323,324)	(418,482)
Held to Maturity, Fair value	2,250,554	2,104,652
Net Carrying Amount	2,573,708	2,523,134
State and political subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	3,042,275	2,739,447
Gross Unrealized Gains	13,072	12,035
Gross Unrealized Losses	(224,338)	(222,946)
Held to Maturity, Fair value	2,831,009	2,528,536
Allowance for Credit Losses	(1,845)	(2,645)
Net Carrying Amount	$ 3,040,430	$ 2,736,802

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